Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4dcc871a3e4ad36…

MALICIOUS

PDF

80.7 KB Created: 2021-09-10 16:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0a2d59093c3486688f32a9f2eaa0fab0 SHA-1: 7206b4475982b0ead495fb29c24fd92c72658329 SHA-256: e4dcc871a3e4ad360fa4b43735adef5b6bd4982ab926806b7b4c3a698ba2f933
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting a phishing or SEO manipulation scheme. No scripts were extracted, but the presence of numerous external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://africanhairbraidingsalon.com/userfiles/file/metugulorakabegeved.pdf In PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/29638346308.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/87937022040.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/kitinuzemorizigadiruka.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/84339245685.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/23593312319.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/e73e2e6c148a7ef71996523d53ced8c9/dugezosak.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/87033075518.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/vorarepozodipixa.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134921077277---bizemuwogimuzizim.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210909202000.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/41424641293.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/pevelafiwojep.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/rimolen.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/mazivex.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/doruxizopumulatevojimo.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/52204587390.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613976db831ec---23080339936.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/daraz.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/fegejukizakekavulu.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/vowex.pdfIn PDF document text
    • https://premiersuli.hu/files/files/tulorejoxefonejomo.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/64580438410.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/55472269311.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/18646145756.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613b55fb74311---86527680302.pdfIn PDF document text
    • http://voijin.com/userfiles/files/87550944211.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/9515f7770ev3k179q8sritl6p7/xasejok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=sd+card+settings+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F3 16808 bytes
SHA-256: a7777a188838d0819cfa9b68f91fe83c7e1e576967dfe0a2e73e3d04dfd7c8d8
font_02_sfnt_off00011d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D26 10576 bytes
SHA-256: 0f962bd09ef4007e7c2bd8fff32aea4e59f0a340ab8d9e28d549ef523335180f

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